🍾 Bottle Count Calculator
Enter your batch volume and bottle size to calculate how many bottles you'll need, with a buffer for loss during bottling.
How the bottle count is worked out
The calculator converts your batch to fluid ounces, removes the loss buffer, then divides by the bottle size and rounds down:
usable oz = gallons × 128 × (1 - buffer% / 100)
bottles = floor(usable oz / bottle size in oz)
cases = bottles / 24A 5 gallon batch is 640 fl oz. Take the default 5% buffer and 608 oz is left; divided by a 12 oz bottle that is 50.67, so the tool reports 50 bottles and 2.1 cases. Without any buffer the same batch fills 53. The count is always rounded down, because a part-filled bottle is not a bottle you can cap and carbonate.
Choosing a bottle size and a buffer
| Bottle | Volume | Per 5 gal at 5% loss |
|---|---|---|
| Standard longneck | 12 fl oz (355 ml) | 50 |
| Pint / tallboy | 16 fl oz (473 ml) | 38 |
| Bomber | 22 fl oz (650 ml) | 27 |
| Belgian / champagne | 25.4 fl oz (750 ml) | 23 |
The buffer stands for what never reaches a bottle: trub and yeast left behind in the fermenter, the dead space under the racking cane, hop absorption and the dregs in the bottling bucket. Five per cent is a sensible default for a clean siphon; go to 8-10% if you dry hop heavily or bottle straight off a thick yeast cake. The field accepts 0 to 30.
Frequently asked questions
How many 12 oz bottles does a 5 gallon batch fill?
53 if nothing is lost, and 50 once you allow the default 5% for trub and transfer losses. Two cases plus a couple of spares is the practical answer.
How many bottles are in a case?
24, which is what the case figure divides by. A 5 gallon batch in 12 oz bottles comes to about 2.1 cases, so keep three empty cases to hand.
Can I mix bottle sizes in one batch?
Yes. Work out the count for each size separately and stop when the total volume reaches your usable ounces — 608 oz fills, say, 20 bombers (440 oz) and 14 longnecks (168 oz).